202 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 20 



86 



Fig. 86. Anadara {Scapharca) biangulata (Sowerby) 1833. Isla 

 Isabel, Gulf of California. Dorsal view showing the ar- 

 rangement of the ligament. Length, 25.6 mm. 



specimen dredged alive in this collection is from Isla Isabel, Mexico, 10 

 to 15 fms. 



Distribution: San Felipe, east coast of Baja California (Gulf of Cali- 

 fornia), to Payta, Peru. The Galapagos Islands. (The two latter local- 

 ities are taken from Hertlein and Strong, 1943.) 



Anadara (Scapharca) aviculaeformis (Nyst) 1848 

 PI. 14, figs. 21 a-c, 23 ; text-figs. 88 a-c 



Area aviculaeformis Nyst, Mem. Acad. Roy. Sci. Belgique, vol. 22, 



1848, p. 12. 

 Syn.: Area auriculata Sowerby 1833 (not Lamarck 1819). 

 Area aviculoides Reeve 1844 (not de Koninck 1842). 

 Type loc.: Santa Elena, Ecuador; 10 fms; mud. 

 Holotype: British Museum? 



Remarks: There seem to be few records of this species. Apparently 

 Anadara biangulata (Sowerby) has often been given this name. Cuming 

 collected the type described by Sowerby, which measured 30 mm. C. B. 

 Adams (1852) gives a record of one specimen of Area avieuloides from 

 Panama, but says the specimen was too young to be determined with 

 confidence. Dall (1909) gives its range as from Panama to Guayaquil. 

 Maury (1922) reports one specimen from Panama (Newcomb collec- 

 tion ) , with a length of 23 mm. Two specimens are present in the Allan 



